Lock nut



FIG. 1 is a perspective view of a lock nut showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a cross-section view taken along line 8-8 of FIG. 6.

The broken lines in the Figures are for the purpose of illustrating unclaimed portions of the lock nut and form no part of the claimed design. The dash-dot-dash lines represent boundary lines. The shade lines in the Figures show contour and not surface ornamentation. 

CLAIM The ornamental design for a lock nut, as shown and described. 